Увійти

Готові списки джерел за темами / Boundary currents

Зміст

Статті в журналах
Дисертації
Книги
Частини книг
Тези доповідей конференцій
Звіти організацій

Добірка наукової літератури з теми "Boundary currents"

Автор: Grafiati

Опубліковано: 25 січня 2025

Оновлено: 19 липня 2025

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Boundary currents".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "Boundary currents"

1

Hogg, Nelson G., and William E. Johns. "Western boundary currents." Reviews of Geophysics 33, S2 (1995): 1311–34. http://dx.doi.org/10.1029/95rg00491.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Ruju, Andrea, Pablo Higuera, Javier L. Lara, Inigo J. Losada, and Giovanni Coco. "RIP CURRENTS ON A BARRED BEACH." Coastal Engineering Proceedings 1, no. 33 (2012): 38. http://dx.doi.org/10.9753/icce.v33.currents.38.

Повний текст джерела

Анотація:

This work presents the numerical study of rip current circulation on a barred beach. The numerical simulations have been carried out with the IH-FOAM model which is based on the three dimensional Reynolds Averaged Navier-Stokes equations. The new boundary conditions implemented in IH-FOAM have been used, including three dimensional wave generation as well as active wave absorption at the boundary. Applying the specific wave generation boundary conditions, the model is validated to simulate rip circulation on a barred beach. Moreover, this study addresses the identification of the forcing mechanisms and the three dimensional structure of the mean flow.

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Cessi, Paola, and Christopher L. Wolfe. "Adiabatic Eastern Boundary Currents." Journal of Physical Oceanography 43, no. 6 (2013): 1127–49. http://dx.doi.org/10.1175/jpo-d-12-0211.1.

Повний текст джерела

Анотація:

Abstract The dynamics of the eastern boundary current of a high-resolution, idealized model of oceanic circulation are analyzed and interpreted in terms of residual mean theory. In this framework, it is clear that the eastern boundary current is adiabatic and inviscid. Nevertheless, the time-averaged potential vorticity is not conserved along averaged streamlines because of the divergence of Eliassen–Palm fluxes, associated with buoyancy and momentum eddy fluxes. In particular, eddy fluxes of buoyancy completely cancel the mean downwelling or upwelling, so that there is no net diapycnal residual transport. The eddy momentum flux acts like a drag on the mean velocity, opposing the acceleration from the eddy buoyancy flux: in the potential vorticity budget this results in a balance between the divergences of eddy relative vorticity and buoyancy fluxes, which leads to a baroclinic eastern boundary current whose horizontal scale is the Rossby deformation radius and whose vertical extent depends on the eddy buoyancy transport, the Coriolis parameter, and the mean surface buoyancy distribution.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Ozdemir, Celalettin Emre, and Sahar Haddadian. "SEDIMENT TRANSPORT DUE TO CURRENT-SUPPORTED TURBIDITY CURRENTS OVER AN ERODIBLE BED." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 33. http://dx.doi.org/10.9753/icce.v36.currents.33.

Повний текст джерела

Анотація:

Wave- and current-supported turbidity currents (WCSTCs), are one of the chief participants in shaping the marine geomorphology. What makes WCSTCs different from other turbidity currents is that boundary layer turbulence is required to suspend the sediments rather than the self-motion of the turbidity currents. In the presence of a mild slope, the gravitational acceleration drives the suspended sediments offshore (Sternberg et al., 1996; Wright et al., 2001). Depending on what dominates the boundary layer turbulence (BLT), we further define two major subclasses of WCSTCs: (i) wave-supported (WSTCs), and (ii) current-supported turbidity currents (CSTCs). Although significant advances have been made on the details of WSTCs (Ozdemir et al., 2011; Yu et al., 2014; Cheng et al., 2015), less is known about CSTCs. The objective of present study is to investigate the role of alongshore currents on CSTC dynamics over an erodible bottom boundary. The focus here is to identify the possible role of erosion on CSTC dynamics, and assess the coupling between current-induced BLT and suspended sediments for various bed erodibility parameters, i.e. critical shear stress, erosion coefficient, and settling velocity.

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Capodicasa, Erminia, Pietro Scandura, and Foti Enrico. "STEADY CURRENTS INDUCED BY SEA WAVES PROPAGATING OVER A SLOPING BOTTOM." Coastal Engineering Proceedings 1, no. 32 (2011): 35. http://dx.doi.org/10.9753/icce.v32.currents.35.

Повний текст джерела

Анотація:

A numerical model aimed at computing the mean velocity generated by a sea wave propagating over a sloping bottom, offshore the breaker line, is presented. The model is based on the assumption that the fluid domain can be partitioned into two boundary layers and a core region where at a first order of approximation the flow can be regarded as irrotational. The irrotational flow is computed by using a theory based on the assumption of small amplitude waves which allows both fully absorbed waves and partially reflected waves at the coastline to be considered. The distribution of the mean velocity is controlled by the ratio between the thickness of the boundary layer and the wave amplitude. When this ratio is small, the mean velocities are rather constant along the depth and a second boundary layer develops close to the bottom. In the case of fully reflected waves such boundary layer separates and the mean vorticity can be convected far from the bottom.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Sana, Ahmad, and Hitoshi Tanaka. "NUMERICAL MODELING OF A TURBULENT BOTTOM BOUNDARY LAYER UNDER SOLITARY WAVES ON A SMOOTH SURFACE." Coastal Engineering Proceedings, no. 36 (December 30, 2018): 26. http://dx.doi.org/10.9753/icce.v36.currents.26.

Повний текст джерела

Анотація:

A number of studies on bottom boundary layers under sinusoidal and cnoidal waves were carried out in the past owing to the role of bottom shear stress on coastal sediment movement. In recent years, the bottom boundary layers under long waves have attracted considerable attention due to the occurrence of huge tsunamis and corresponding sediment movement. In the present study two-equation turbulent models proposed by Menter(1994) have been applied to a bottom boundary layer under solitary waves. A comparison has been made for cross-stream velocity profile and other turbulence properties in x-direction.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Cember, Richard P. "On deep western boundary currents." Journal of Geophysical Research: Oceans 103, no. C3 (1998): 5397–417. http://dx.doi.org/10.1029/97jc02422.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Csanady, G. T., and J. L. Pelegri. "Vorticity balance of boundary currents." Journal of Marine Research 53, no. 2 (1995): 171–87. http://dx.doi.org/10.1357/0022240953213269.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Adityawan, Mohammad Bagus, Hitoshi Tanaka, and Pengzhi Lin. "BED STRESS INVESTIGATION UNDER BREAKING SOLITARY WAVE RUNUP." Coastal Engineering Proceedings 1, no. 33 (2012): 23. http://dx.doi.org/10.9753/icce.v33.currents.23.

Повний текст джерела

Анотація:

The bed stress under breaking solitary wave runup was investigated in this study using the Simultaneous Coupling Method (SCM). The SCM couples the shallow water equation (SWE) with k-w model. The depth averaged velocity from SWE is applied as the upper boundary condition in k-w model for bed stress assessment from the boundary layer. It was found that the boundary layer approach provides more accurate bed stress estimation than the empirical method, which leads to a more accurate prediction of runup and wave profile. The accumulation of bed stress in during solitary wave runup was evaluated. The bed stress on the direction leaving the shoreline will have more impact in the overall process. However, during a short period of run up process, bed stress toward the shoreline may have significant effect as well.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Ma, Peifeng, and Ole Secher Madsen. "AN OPEN BOUNDARY CONDITION FOR APPLICATION IN NUMERICAL COASTAL MODELS." Coastal Engineering Proceedings 1, no. 32 (2011): 30. http://dx.doi.org/10.9753/icce.v32.currents.30.

Повний текст джерела

Анотація:

Open boundaries (OBs) are usually unavoidable in numerical coastal circulation simulations. At OBs, appropriate open boundary conditions (OBCs) are required and a good OBC should be able to let outgoing waves freely pass to the exterior of a computational domain without creating reflections at the OBs. In the present study, a methodology has been developed to predict two parameters, phase speed c_r and decay time T_f, in a standard OBC formulation, so that the OBC is significantly improved compared to commonly used existing OBCs with specified c_r and T_f. For the conditions where wave period is unknown, the OBC with approximated c_r and T_f may be applied and a test reveals that this OBC is able to yield good results in typical coastal flow conditions. In addition, a Swing-Door Boundary Condition (SDBC) is proposed and tested for application at an offshore open boundary where both incoming and outgoing waves exist.

Стилі APA, Harvard, Vancouver, ISO та ін.

Більше джерел

Дисертації з теми "Boundary currents"

1

Cuny, Jerome. "Labrador Sea boundary currents /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10959.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Kuehl, Joseph J. "On the dynamics of oceanic gap-traversing boundary currents /." View online ; access limited to URI, 2009. http://digitalcommons.uri.edu/dissertations/AAI3401123.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Chadwick, David Bartholomew. "Tidal exchange at the bay-ocean boundary /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9823709.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Chang, Kyung-Il. "The shelfward penetration of western boundary currents." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.239963.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Le, Bras Isabela Astiz. "Dynamics of North Atlantic western boundary currents." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/109056.

Повний текст джерела

Анотація:

Thesis: Ph. D., Joint Program in Physical Oceanography (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 163-174).<br>The Gulf Stream and Deep Western Boundary Current (DWBC) shape the distribution of heat and carbon in the North Atlantic, with consequences for global climate. This thesis employs a combination of theory, observations and models to probe the dynamics of these two western boundary currents. First, to diagnose the dynamical balance of the Gulf Stream, a depth-averaged vorticity budget framework is developed. This framework is applied to observations and a state estimate in the subtropical North Atlantic. Budget terms indicate a primary balance of vorticity between wind stress forcing and dissipation, and that the Gulf Stream has a significant inertial component. The next chapter weighs in on an ongoing debate over how the deep ocean is filled with water from high latitude sources. Measurements of the DWBC at Line W, on the continental slope southeast of New England, reveal water mass changes that are consistent with changes in the Labrador Sea, one of the sources of deep water thousands of kilometers upstream. Coherent patterns of change are also found along the path of the DWBC. These changes are consistent with an advective-diffusive model, which is used to quantify transit time distributions between the Labrador Sea and Line W. Advection and stirring are both found to play leading order roles in the propagation of water mass anomalies in the DWBC. The final study brings the two currents together in a quasi-geostrophic process model, focusing on the interaction between the Gulf Stream's northern recirculation gyre and the continental slope along which the DWBC travels. We demonstrate that the continental slope restricts the extent of the recirculation gyre and alters its forcing mechanisms. The recirculation gyre can also merge with the DWBC at depth, and its adjustment is associated with eddy fluxes that stir the DWBC with the interior. This thesis provides a quantitative description of the structure of the overturning circulation in the western North Atlantic, which is an important step towards understanding its role in the climate system.<br>by Isabela Astiz Le Bras.<br>Ph. D.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Munday, David R. "On the flow separation of western boundary currents." Thesis, University of Reading, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.415521.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Stahr, Frederick R. "Transport and bottom boundary layer observations of the North Atlantic deep western boundary current at the Blake Outer Ridge /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/10998.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Parsadous, Ali. "Vertical sidewall boundary layers in combined waves and currents." Thesis, University College London (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339101.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Edberg, Richard. "Vortex Currents near the Boundary of a Two-Component Superconductor." Thesis, KTH, Fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-209923.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Ceballos, Lina Isabel. "North pacific gyre oscillation synchronizes climate fluctuations in the eastern and western boundary systems." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26552.

Повний текст джерела

Анотація:

Thesis (M. S.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2009.<br>Committee Chair: Di Lorenzo, Emanuele; Committee Member: Bracco, Annalisa; Committee Member: Webster, Peter J.. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Стилі APA, Harvard, Vancouver, ISO та ін.

Більше джерел

Книги з теми "Boundary currents"

1

Hunt, Heather D. Boundary current experiment I & II, RAFOS float data report, 1994-1997. Woods Hole Oceanographic Institution, 1998.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Okkonen, Stephen R. Seasonality of boundary conditions for Cook Inlet, Alaska. Coastal Marine Institute, University of Alaska, Minerals Management Service, Dept. of the Interior, and the School of Fisheries & Ocean Sciences, 2009.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Shen, J. Computational electromagnetics using boundary elements: Advances in modelling eddy currents. Computational Mechanics Publications, 1995.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Cessi, Paola. On the role of topography and of boundary forcing in the ocean circulation. Woods Hole Oceanographic Institution, 1987.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Carlos N. Lopes da Costa. A numerical study of wind forcing in the eastern boundary current system off Portugal. Naval Postgraduate School, 1989.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

6

United States. National Aeronautics and Space Administration., ed. Observations of the magnetopause current layer: Cases with no boundary layer and tests of recent models. National Aeronautics and Space Administration, 1995.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Fung, Shing F., and Theodore A. Fritz. The magnetospheric cusps: Structure and dynamics. Springer, 2011.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Shen, Jinxing. Computation of linear and nonlinear Eddi currents with the boundary element method. [s.n.], 1994.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Jessen, Paul F. Hydrographic and Acoustic Doppler Current Profiler (ADCP) data from the ONR Eastern Boundary Current Accelerated Research Iniative - June 9-16, 1992. Naval Postgraduate School, 1993.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

10

United States. National Aeronautics and Space Administration., ed. Review of geography internship on convective wave project. Univ. of Northern Colorado, Geography Dept., 1990.

Знайти повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Більше джерел

Частини книг з теми "Boundary currents"

1

Atkinson, Larry P. "Western Boundary Currents." In Global Change – The IGBP Series. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-92735-8_3.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

McCreary, Julian P., and Satish R. Shetye. "Sverdrup Flow and Boundary Currents." In Observations and Dynamics of Circulations in the North Indian Ocean. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5864-9_11.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Kamenkovich, V. M., M. N. Koshlyakov, and A. S. Monin. "Eddies of Western Boundary Currents." In Synoptic Eddies in the Ocean. Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4502-9_4.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Yamauchi, M., R. Lundin, L. Eliasson, S. Ohtani, and J. H. Clemmons. "Relationship between Large-, Meso-, and Small-Scale Field-Aligned Currents and their Current Carriers." In Polar Cap Boundary Phenomena. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5214-3_14.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Verweij, A. P. "Review on Boundary-Induced Coupling Currents." In Advances in Cryogenic Engineering Materials. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4757-9056-6_139.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Pierini, Stefano. "Ageostrophic Currents in Oceanic Boundary Layers." In UNITEXT for Physics. Springer Nature Switzerland, 2025. https://doi.org/10.1007/978-3-031-77991-6_16.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Krawczyk, A. "The Calculation of Transient Eddy Currents by Means of the Boundary Element Method." In Boundary Elements VIII. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-662-22335-2_36.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Potemra, T. A. "Sources of Large-Scale Birkeland Currents." In Physical Signatures of Magnetospheric Boundary Layer Processes. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1052-5_1.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

McAnally, W. H., and E. J. Hayter. "Estuarine Boundary Layers and Sediment Transport." In Residual Currents and Long-term Transport. Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4613-9061-9_19.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Troshichev, O. A. "Low-latitude boundary layer and generation of field-aligned currents." In Earth's Low-Latitude Boundary Layer. American Geophysical Union, 2003. http://dx.doi.org/10.1029/133gm33.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "Boundary currents"

1

Guanti, Robert J., and Harvey P. Hack. "Determination of the Best Hydrodynamic Parameter for Modelling Flow on Cathodically Polarized Surfaces." In CORROSION 1987. NACE International, 1987. https://doi.org/10.5006/c1987-87267.

Повний текст джерела

Анотація:

Abstract Short and long term velocity experiments were performed utilizing a rotating cylinder electrode. This was to determine the best way to model in the laboratory the flow conditions in service on a cathodically polarized surface or on anodically polarized zinc. This was studied by measuring the cathodic current required to protect HY-80 steel, nickel-aluminum-bronze and commercially pure titanium in flowing seawater. Potentiodynamic scans on a one inch diameter cylindrical specimen were run at rotation speeds of 50, 100, 200, 800 and 2000 rpm. The limiting current portion of the resulting polarization curves indicated that all three materials illustrated rotation speed dependent behavior. This behavior was consistent with a mechanism whereby the reaction kinetics are governed by oxygen diffusion through a fluid boundary layer. The currents measured for HY-80 were approximately an order of magnitude lower than those consistent with boundary layer diffusion-, due to the formation of a barrier layer of calcareous deposits or fouling. Increased rotation speeds, which result in increased shear stresses resulted In currents more consistent with the diffusion model, indicating that higher velocities result in stripping away surface deposits or change the morphology of the barrier film. The effect of velocity on the anodic current output for zinc sacrificial anodes was also evaluated to determine the best way to model flow over a sacrificial anode. Some velocity effects were observed, but could not be related to a specific reaction control mechanism. Long term potentiostatic tests were run to determine the effect of corrosion products and/or biological films on flow modelling of cathodic current demand. Rotation speeds of 40, 160, 800, 1600 and 2000 rpm were studied. The initial currents observed for bronze and steel correlated well with those values predicted for boundary layer diffusion. Shortly after polarizing these materials, the cathodic current decreased more than an order of magnitude, probably due to the formation of a film, such as a calcareous deposit. Titanium illustrated low currents initially, possibly due to the presence of a surface film. After a brief period of cathodic protection the current increased, indicating that the initial film was reduced. Upon reaching steady state the currents were still lower than for boundary layer diffusion, indicating the presence of another film.

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Miyasaka, M., J. Ishiguro, K. Kishimoto, and S. Aoki. "Application of Bem to Cathodic Protection of Seawater Pump." In CORROSION 1995. NACE International, 1995. https://doi.org/10.5006/c1995-95288.

Повний текст джерела

Анотація:

Abstract A three-dimensional boundary element method (3D-BEM) was developed to quantitatively estimate cathodic protection and macro-cell corrosion. To confirm the validity and usefulness of the BEM for analysis of fluid machines handling seawater with complex 3D fields, experiments and analyses were performed. A cast iron vertical pump with Zn anodes for cathodic protection, was submerged in seawater and operated. Potential distributions inside the pump and anodic currents on the Zn anodes were measured. Polarization characteristics of the pump material were also examined as functions of flow rate, time and temperature. Extremely accurate analyses on potential and current density distributions were performed by reflecting the polarization characteristics in the boundary conditions, and by means of appropriate modeling that takes account of the symmetry of the object being analyzed.

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Klein, Oliver, Hans Hoffmeister, and Jens Uwe Brandt. "Investigation of the Effects of Multiphase Fluid Parameters on Corrosion Currents in Rotating Disc Crevices." In CORROSION 2005. NACE International, 2005. https://doi.org/10.5006/c2005-05119.

Повний текст джерела

Анотація:

Abstract The increasing use of multiphase pump systems in the oil and gas industry has drawn attention to materials resisting erosion-corrosion in crevices between rotating and fixed pump components. A new type of laboratory test facility enables experimental modeling of respective electrochemical and mechanical wear effects on rotating discs both of the same material at conditions of erosion in the crevice in between. The paper discusses the influences of rotational velocity and crevice dimensions on external corrosion currents between the 17Cr-2Ni forged steel rotating and fixed discs in synthetic formation water at various sand and oil fractions. As a main result the rotating disc always exhibits anodic dissolution current peaks in the presence of erosive particles. The results are discussed with respect to boundary diffusion layer properties at both the rotating and fixed disc. As a conclusion for the operation of multiphase pump components, the effect of electrochemical wear should be considered even in cases of identical materials of different components.

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Yang, Yun Kuan, and Yi Jin. "Computer Simulation Techniques on the Distributions of Current and Charge on Circular Waveguide Wall." In 12th Annual International Conference on Material Science and Engineering. Trans Tech Publications Ltd, 2025. https://doi.org/10.4028/p-5am7uj.

Повний текст джерела

Анотація:

In this paper, a set of computer simulation techniques are put forward according to Helmholtz equation and the boundary conditions of the metallic circular waveguide, the different expressions on propagation modes of electromagnetic wave are given, and then the distribution rules of the tube-wall currents and charges are analyzed and discussed in different modes. The algorithm and techniques presented are helpful for the industrial application of measurements and design of the relevant devices.

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Li, Y., F. P. Dawalibi, J. Cheng, and Y. Jiang. "Integrated Corrosion Analysis Software and Its Application to Dc Corrosion Analysis." In CONFERENCE 2023. NACE International, 2023. https://doi.org/10.5006/c2023-18819.

Повний текст джерела

Анотація:

Abstract This paper introduces a novel approach to analyze corrosion effects and to model electrochemical problems with non-linear boundary conditions. The computation of the electrical current distribution along protected structures is based on an automated algorithm involving the polarization curves and an integrated iterative process. The method is first used to solve a well-known benchmark test problem and the results are compared to those obtained using the benchmark analytical expression. Then, an example of a realistic cathodic protection system aimed at mitigating stray currents from a HVDC electrode on a pipeline is described and discussed. It is shown that the proposed iterative approach accurately computes the electrochemical potential process. This approach constitutes the core effort in the development of an accurate non-linear polarization solver.

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Bruemmer, S. M., T. F. Soran, J. I. Cole, B. W. Arey, L. A. Chariot, and C. F. Windisch. "Radiation-Induced Segregation of Impurities and Effects on the Electrochemistry of Nickel and Stainless Alloys." In CORROSION 1995. NACE International, 1995. https://doi.org/10.5006/c1995-95420.

Повний текст джерела

Анотація:

Abstract Radiation-induced grain boundary segregation (RIS) of silicon and phosphorus in austenitic stainless steels is established and its influence on electrochemical behavior investigated. Silicon enrichment increases with irradiation dose for both neutrons and heavy ions. Interfacial concentrations reach about 8 at% after irradiation exposures to 10 dpa. Phosphorus segregates strongly during initial thermal treatment, but no conclusive evidence of further boundary enrichment could be determined after irradiation. These impurities have different effects on the electrochemical behavior of Ni and Fe-Ni-Cr alloys. Silicon additions from 2 to 23 at% improves passivation behavior in the stainless alloys, but as little as 5 at% impairs passivity in nickel where the breakdown potential increased with Si content. Low levels of phosphorus increase passive currents in the stainless alloy, while completely eliminating passivity in nickel.

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Adey, Robert A., and John Baynham. "Design and Optimisation of Cathodic Protection Systems Using Computer Simulation." In CORROSION 2000. NACE International, 2000. https://doi.org/10.5006/c2000-00723.

Повний текст джерела

Анотація:

Abstract The design of cathodic protection systems normally relies on a combination of experience, experimental data and heuristics. However, problems and failures of CP systems not only has an economic cost, it can also present a threat to life and the environment. This paper will describe the application of a software system designed to simulate the performance of cathodic protection systems and predict the impact of the design parameters and the environment on its performance. Two applications are presented. The first describes an approach to the global optimisation of a ship's Impressed Current Cathodic Protection (ICCP) system using the boundary element method coupled with "Simulated Annealing" (SA) algorithm and search methods. In the second the modelling and optimisation of a CP systems for storage tanks is described including the impact of coating holidays and stray currents.

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Pesce, Norberto Aldo, Norberto Antonio Pesce, Héctor C. Albaya, Guy Bishop, and Andrés Peratta. "Case Study of an ICCP Design and Installation for Well Casings Using Boundary Elements Software, Evaluating Different Deep Anode Architectures and Interference to Nearby Casings." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07484.

Повний текст джерела

Анотація:

Abstract Impressed current cathodic protection (ICCP) systems can be used very effectively to achieve appropriate mitigation of well casing corrosion, but it may be difficult and expensive to define the most convenient anode distribution in order to adequately protect the desired casings and not interfere with nearby structures. Once the system is installed, the cost of redesign may be high if experimental measurements indicate that the required protection is not achieved or that destructive interference is taking place. It is therefore both desirable and cost-effective to establish performance of the ICCP system before it is installed. Such assessment can be achieved through the use of mathematical modelling performed using numerical techniques. Of the available methodologies it is the boundary element method that is applied in this work. To perform such simulation a model of the well casings is constructed (reflecting the directionally drilled profile) and the multiple anode ground-beds, including the return-path resistances along the cables and well casings. In order to effectively capture the electrical behaviour of the currents, the resistivity of the ground through which current passes must be identified. Running alternative scenarios of the models to readily quantify the effects of alternative assumptions, provides valuable understanding to the CP system designer of probable behaviour, and contributes to design robustness. At a practical level, the designer can simply carry out tests of alternative anode layouts (depths, location etc.) as an input to selection of an optimised, final, configuration. The objective of this paper is to show how such techniques have been applied to an actual ICCP system protecting well casings in the Amazon rainforest

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Larché, N., J. Blanc, I. Iken, and D. Thierry. "Galvanic Corrosion Induced by the Use of High Alloy Stainless Steel in Seawater Applications." In CORROSION 2012. NACE International, 2012. https://doi.org/10.5006/c2012-01080.

Повний текст джерела

Анотація:

Abstract The galvanic corrosion of carbon steel (UNS G10150) and of copper-nickel 90/10 (UNS C70600) coupled to superduplex stainless steel (UNS S32750) in seawater was investigated from 6°C to 70°C, with different cathode to anode ratios. The effect of chlorination on galvanic corrosion rates was also studied. Continuous monitoring of the open-circuit potentials and galvanic currents were performed to measure the exact evolution and the contribution of the galvanic corrosion on the total corrosion. Results showed that formation of natural biofilms and precipitation of calcareous deposits on surfaces had a very significant impact on the cathodic efficiency, which is directly correlated to the rate of galvanic corrosion. For all the tested configurations, chlorination led to a significant decrease of the measured galvanic currents due to the low cathodic efficiency of surfaces in chlorinated media (i. e. no biofilm). The long term exposure of specimens allowed to draw realistic pseudo-polarization curves which were used in a boundary element modeling software.

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Brasil, Simone L. D. C., Denise S. de Freitas, Walmar Baptista, José Claudio F. Telles, José Antonio F. Santiago, and João Hipolito L. Oliver. "Potential Distribution on Cathodically Protected Buried Pipelines with Aged and High Performance Coatings." In CORROSION 2006. NACE International, 2006. https://doi.org/10.5006/c2006-06165.

Повний текст джерела

Анотація:

Abstract High performance coatings provides excellent protection to pipelines in service conditions. Such coatings have been applied to replace aged coatings, which have lost efficiency due to transport, installation, operation or even due to aging processes. There is growing concern regarding cathodic protection systems when segments of high performance coating are placed together among aged sections, since the current injected assumes a non-uniform profile. The present work determines the potential distributions on cathodically protected buried pipelines. Computer simulations using a three-dimensional application of the Boundary Element Method and experimental analysis with different soil conditions are carried out. Parameters such as the distance of anodes to pipelines, level of injected currents, efficiency of aged coating, soil resistivity and presence of scattered/localised defects are taken into account. The numerical simulations are based on experimental results and field conditions. In a future work, cathodic disbondment tests will be present, based on the potential distribution numerically obtained.

Стилі APA, Harvard, Vancouver, ISO та ін.

Звіти організацій з теми "Boundary currents"

1

Cessi, Paola. Separation of Western Boundary Currents. Defense Technical Information Center, 1992. http://dx.doi.org/10.21236/ada256516.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

2

Johns, William E. Dynamics of Boundary Currents and Marginal Seas. Defense Technical Information Center, 1997. http://dx.doi.org/10.21236/ada628241.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

3

Johns, William E. Dynamics of Boundary Currents and Marginal Seas. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada626445.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

4

Johns, William E. Dynamics of Boundary Currents and Marginal Seas: Windward Passage Experiment. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada612623.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

5

Shi, Donglu. Transport critical currents and grain boundary coupling in high-{Tc} superconductors. Office of Scientific and Technical Information (OSTI), 1991. http://dx.doi.org/10.2172/10144496.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

6

Joyce, Terrence M. Tracing the Pathway and Transport of Proto-NPIW Flowing Out of the Sea of Okhotsk into the Boundary Currents of the NW Pacific. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada389289.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

7

Li, Honghai, Mitchell Brown, Lihwa Lin, et al. Coastal Modeling System user's manual. Engineer Research and Development Center (U.S.), 2024. http://dx.doi.org/10.21079/11681/48392.

Повний текст джерела

Анотація:

The Coastal Modeling System (CMS) is a suite of coupled 2D numerical models for simulating nearshore waves, currents, water levels, sediment transport, morphology change, and salinity and temperature. Developed by the Coastal Inlets Research Program of the US Army Corps of Engineers, the CMS provides coastal engineers and scientists a PC-based, easy-to-use, accurate, and efficient tool for understanding of coastal processes and for designing and managing of coastal inlets research, navigation projects, and sediment exchange between inlets and adjacent beaches. The present technical report acts as a user guide for the CMS, which contains comprehensive information on model theory, model setup, and model features. The detailed descriptions include creation of a new project, configuration of model grid, various types of boundary conditions, representation of coastal structures, numerical methods, and coupled simulations of waves, hydrodynamics, and sediment transport. Pre- and post-model data processing and CMS modeling procedures are also described through operation within a graphic user interface—the Surface- water Modeling System.

Стилі APA, Harvard, Vancouver, ISO та ін.

8

Reusch, M. F. Free boundary skin current MHD (magnetohydrodynamic) equilibria. Office of Scientific and Technical Information (OSTI), 1988. http://dx.doi.org/10.2172/5256723.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

9

Watts, D. R., Kathleen A. Donohue, and Arlene Guest. Western Boundary Current Systems Virtual Poster Session. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada624673.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

10

Rhines, Peter B. Labrador Sea Boundary Current and Convection Dynamics. Defense Technical Information Center, 2001. http://dx.doi.org/10.21236/ada625145.

Повний текст джерела

Стилі APA, Harvard, Vancouver, ISO та ін.

Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!